# A167140 (b-file synthesized from sequence entry)
0 1
1 4
2 24
3 416
4 34400
5 13561728
6 22961051392
7 160934805885952
8 4612329945733989888
9 537318814887463743641600
10 253532269357851227988228362240
11 483356648964255814869226601582346240